ExternalProject_Add( GLM
	URL ${CMAKE_SOURCE_DIR}/glm-0.9.9.8.zip
	DOWNLOAD_EXTRACT_TIMESTAMP TRUE
	UPDATE_COMMAND ""
	CONFIGURE_COMMAND ""
	BUILD_COMMAND ""
	INSTALL_COMMAND ""
)
ExternalProject_Get_Property( GLM SOURCE_DIR )
SET( GLM_INSTALL_DIR ${SOURCE_DIR} )